Return an approximately correct drop effect from WebDragTarget::OnDrop.

chrome/browser/tab_contents/web_drag_utils_win.cc

Index: chrome/browser/tab_contents/web_drag_utils_win.cc
diff --git a/chrome/browser/tab_contents/web_drag_utils_win.cc b/chrome/browser/tab_contents/web_drag_utils_win.cc
index 5c15f45c082a6a785e349bf402e8de1c0a74a9f7..6796876cf89af6bf6977943b6b27ece2622a2f8a 100644
--- a/chrome/browser/tab_contents/web_drag_utils_win.cc
+++ b/chrome/browser/tab_contents/web_drag_utils_win.cc
@@ -25,5 +25,16 @@ WebDragOperationsMask WinDragOpToWebDragOp(DWORD effect) {
   return op;
 }
 
+DWORD WebDragOpToWinDragOp(WebDragOperationsMask op) {
+  DWORD win_op = DROPEFFECT_NONE;
+  if (op & WebDragOperationCopy)
+    win_op |= DROPEFFECT_COPY;
+  if (op & WebDragOperationLink)
+    win_op |= DROPEFFECT_LINK;
+  if (op & WebDragOperationMove)
+    win_op |= DROPEFFECT_MOVE;
+  return win_op;
+}
+
 }  // namespace web_drag_utils_win